The Founders Constitution, a collaboration between the
University of Chicago and the Liberty Fund, has extensive resource materials on
all aspects of the Constitution. This includes dozens of historical documents
relevant to understanding the First Amendment’s religion clauses.
A fine collection of historical documents pertaining to
religious freedom assembled by a law firm.
This collection of historical documents emphasizes freedom of speech, but has many primary documents of tremendous significance to the development of religious freedom as well.
The American Memory collection at the Library of Congress features 8 collections devoted to religion, including one, http://memory.loc.gov/ammem/collections/petitions/, containing religious petitions in colonial Virginia, many of which pertain directly to the issues of freedom of conscience and the separation of church and state.
For essential historical materials generally, on law, history and diplomacy, the collection assembled by Yale University is superb. http://avalon.law.yale.edu/subject_menus/major.asp lists the major collections.None